Where is version 18 undo function?

Where is Opera 18 undo (ctrl+Z) enable control?
When I close wrong tab I can't reopen it easily as in earlier Opera versions.

I have used with Opera 12 and this supports a full (ctrl+z) control of re opening closed tabs.
It often happens to me that I close a tab and few minutes later there comes an idea and I need to reopen URL.
And sometimes also a previous page (way back) is required.
Closing wrong tab may happen also accidentally.

History doesn't replace ctrl+z function -
1. History doesn't provide go to previous page (instead goes back to history)
2. When I can't find the page in history, I guess that history is sorted by URL opening time, which may be many days earlier

Sigh - Any Reasons to the WHY that is so in other browsers? In my experience ctrl-z is the "default" undo hotkey in most Applikations and AFAIK on Mac Systems it is one of the sacred-keybindings that all Developers should respect (*1). And furthermore, unlike to ctrl-c (known as abort to most old time terminal users like me vs. copy in most GUIs (and Apple)) I am not aware of any conflicts for ctrl-z.

*1: Which would mean that if Opera changes ctrl-z to ctrl-t they would be violating Apples GUI Guidelines. I am not sure how strict Apple is nowadays in enforcing those Guidelines, but decades ago such a violation would have meant that the Software can't be distributed.